If your league has sponsors you'd like to showcase on your website
Classic Website Editor:
Go to the Website tab at the top and click Manage
In the upper right click 'Add-Ons' and click 'Sponsors'
Press the 'Add Sponsor' Button
Fill in Sponsor information and choose an image (their logo)
Press 'Create'
Website Builder:
Go to the Website tab at the top and click Manage
At the top go to Add-ons and select Sponsors
Add and Edit your Sponsors
Add your sponsors to a page using the dropdown arrow beside any Add Content button